Perhaps you should try some spelling variations:
viet cac » vien cac, viet ca, viet bac
cam doan » chan doan, cac doanh, cam hoang
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cac xuc » cam xuc, cac nuoc, chat xuc
xuc cam » phuc cam
doan vi » doan va, don vi, doan thi
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang x hoi. gian viet cac xuc cam doan vi ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. gian viet cac xuc cam doan vi ((cuu tre) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. gian viet cac xuc cam doan vi ((cuu tre) or (cua tre))*.